I have a general question. I just got my tax refund and it's time to go shopping. I know some of you carry extra stock memcals in the car with you in case your burned chips fail.

What is the reliability of previously erased proms that have new info on them.

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91 Formula
305 TPI 5speed
1LE/G92/WS6

Paxton SN92 polished kit, SLP airfoil, ported/polished plenum, March pulleys, Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL (5200rpm limit),Holley 9mm wires,Ac delco R43ts plugs,stock chip,Ford SVO 24# injectors,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened shifter,3:73s w/Auburn posi,170* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

 

I've never had one go bad while in service. They usually dont want to program anymore. Or if they do, when you put them in the car you get a constact check engine light for a bad prom. I dont carry an extra ones... and right now I'm running a 29C256 :P

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92 Z28 5.7
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Ported stock heads, XR270HR-10 cam, TES headers
Crane AFPR, Flowmaster catback, MSD ignition
#24 SVO injectors, 1LE aluminum driveshaft.

Best ET 13.3@107 mph

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Check out the Bin Archive

 

Probably a bigger problem is you made a change and then after driving a little you realized you "flubbed it up".

I always carry a previous KNOWN GOOD version with me for that very reason. After a period of time of using the new BIN, it becomes my new OLD AND TRUSTY.

 

If you get a jump, or alternator shorts you regret not having a spare ECM and Prom. An A/C spike can kill either or both. Also, the *socket* can totally fail with one insertion

 

Once programed it's about impossible to screw it up, but outside A/C can kill it.